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Medullary rays, also known as medullary rays or pith rays, are radial structures in a tree that facilitate the transport of water, nutrients, and carbohydrates between the inner wood (xylem) and the inner bark (phloem). They help in the storage of nutrients and can play a role in wound healing by allowing for the movement of cells during the growth process. Additionally, medullary rays contribute to the mechanical support of the tree by providing structural integrity to the wood.

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true